Frequently Asked Questions

• Who are we and what can we do?
  
  > We are a NdFeB Magnet Manufacturer from China. We are good at making magnetic gears and magnetic couplings. China has a complete chain of rare earth processing industries. Therefore we often provide OEM services for other companies around the world. We can guarantee high quality and low price, we can customize magnetic gears for you in various specifications, you just need to send CAD drawings and describe your requirements.
• What kinds of magnetic gears/magnetic couplings does Magneticgear.net supply?
  
  > We provide sintered and bonded neodymium(more precisely Neodymium-Iron-Boron) magnetic gears. We can supply this kind of product, please contact us.
• How to order magnetic gears in standard models?
  
  >We accept orders in any quantity, but because the price of raw materials (rare earth) changes frequently, we will add or deduct the latest price in the supplementary shipping cost, anyway, our products here are the most cost-effective.
  
• How to customize magnetic gear?
  
  >We accept customization in any quantity, please contact me after referring to the custom models below.
  
• Do you have a printed catalog?
  
  > No, we do not have a printed catalog available. Find information about all of our magnetic gears online, here at our website.
• I need a special size/shape of magnetic gears. Can you supply custom magnets?
  
  > Yes, we can supply custom magnetic gears， please contact us.
• How is neodymium pronounced?
  
  > From a dictionary: [nē ō dim ē um]. Or, nee-oh-dim-ee-um. The only real trick to pronouncing it correctly is to treat the 'y' as an 'i'. It is pronounced as if it were spelled "neodymium".
• How to clean the surface of the magnetic gear？
  
  > Using adhesive tape to capture the metal dust is the best way to clean magnetic gears.
• Which is the strongest type of magnetic gear?
  
  > Neodymium (more precisely Neodymium-Iron-Boron) magnetic gears are the strongest permanent magnetic gears in the world.
• What materials can I use to block/shield magnetic fields?
  
  > Magnetic fields cannot be blocked, only redirected. The only materials that will redirect magnetic fields are ferromagnetic (attracted to magnets), such as iron, steel (which contains iron), cobalt, and nickel. The degree of redirection is proportional to the permeability of the material. The most efficient shielding material is the 80 Nickel family, followed by the 50 Nickel family.
• How is the strength of a magnet measured?
  
  > Gauss meters are used to measure the magnetic field density at the surface of the magnet. This is referred to as the surface field and is measured in gauss (or tesla). Pull Force Testers are used to test the holding force of a magnet that is in contact with a flat steel plate. Pull forces are measured in pounds. Fluxmeters and Helmholtz coils are used to measure the magnetic moment.
• What are neodymium magnets?
  
  > Are they the same as "rare earth"? Neodymium magnets are a member of the rare earth magnet family. They are called "rare earth" because neodymium is a member of the "rare earth" elements on the periodic table. Neodymium magnets are the strongest of the rare earth magnets and are the strongest permanent magnets in the world.
• What are neodymium magnets made from and how are they made?
  
  > Neodymium magnets are composed of neodymium, iron, and boron (they are also referred to as NIB or NdFeB magnets). The powdered mixture is pressed under great pressure into molds. The material is then sintered (heated under a vacuum), cooled, and then ground or sliced into the desired shape. Coatings are then applied if required. Finally, the blank magnets are magnetized by exposing them to a very powerful magnetic field over 30 KOe.
• Will my neodymium magnets lose strength over time?
  
  > Very little. Neodymium magnets are the strongest and most permanent magnets known to man. If they are not overheated or physically damaged, neodymium magnets will lose less than 1% of their strength over 10 years - not enough for you to notice unless you have very sensitive measuring equipment. They won't even lose their strength if they are held in repelling or attracting positions with other magnets over long periods.
• Do I have to worry about temperature with neodymium magnets?
  
  > Yes. Neodymium Iron Boron magnets are sensitive to heat. If a magnet is heated above its maximum operating temperature (176°F (80°C) for standard N grades) the magnet will permanently lose a fraction of its magnetic strength. If they are heated above their Curie temperature (590°F (310°C) for standard N grades), they will lose all of their magnetic properties.
• Will neodymium magnets lose strength if they are held in repelling or attracting positions for a long time?
  
  > In most applications, the answer is simply "no". If the magnets will be exposed to higher temperatures while in repelling applications, the answer is "possibly". The exact answer is a bit too complicated for a FAQ answer and requires specifics about the application.
• What is the difference between the maximum operating temperature and the Curie temperature of the magnets?
  
  > The maximum operating temperature is the maximum temperature the magnet may be continuously subjected to with no significant loss of magnetic strength. This is 176°F (80°C) for standard grades of neodymium magnets. The Curie Temperature is the temperature at which the magnet will become completely demagnetized. This is 590°F (310°C) for standard grades of neodymium magnets. Higher temperature grades have higher maximum operating temperatures and higher Curie Temperatures. At temperatures between these two points, a magnet will permanently lose a portion of its magnetic strength. The loss will be greater the closer to the Curie Temperature it is heated.
• Why are most neodymium magnets plated or coated?
  
  > Neodymium magnets are composed mainly of Neodymium, Iron, and Boron. If neodymium magnets are not plated, the iron in the material will oxidize very easily if exposed to moisture. Even normal humidity will rust the iron over time. To protect the iron from exposure to moisture, most neodymium magnets are plated or coated.
• What is the thickness of the nickel (Ni-Cu-Ni) plating?
  
  > The nickel plating is triple plating of nickel-copper-nickel. The combined thickness totals 15-21μm.
• Where are you located?
  
  > Our main office and warehouse are currently located in China, Beijing. We do not have a retail store, nor are we able to accept walk-in customers or pick-ups.